Lithographic and printing form roller



c. HENDERSON LITHOGRAPHIC AND PRINTING FORM ROLLER Nov. 6, 1923. 1,472,909

Filed Feb. 1, 1922 @QMXM @Q M I Patented Nov. 6, 1923.

UNITED STATES GARL HENDERSON, OF CHIOAGO, ILLINOIS, ASSIGNOB TO MIEHLE PRINTING PRESS & MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLI- I NOIS.

urnonarnrc AND rnin'rme roam ROLLER.

Application filed February 1, 1922. Serial No. 533,187.

To all whom it may 007L6617t.

Be it known that I, CARL HENDERSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Lithographic and Printing Form Rollers, of which the following is a specification. 1

This invention relates to lithographic and 10 printing form rollers.

Lithographic or printing form rollersto do eflicient work should uniformly engage the plate being inked." To do this such rollers must have sufficient weight. A relatively large amount of weight, however, will cause the roller to sag at its middle portion when the gap in the plate is reached, especially if the roller is relatively long. Accordingly, when the advanced edge of a plate reaches a sagging roller an'impact is caused, which results in scumming the plate.

One object of this invention is to prevent detrimental sagging of lithographic and printing form rollers and injurious results occasioned thereby.

Another object is to provide a simple and efiicient lithographic or printing form roller constructed in a manner to meet all of the requirements for successful commercial operation.

These and other objects are accomplished by means of theroller disclosed on the accompanying sheet of drawings, in which-- Figure 1 is a front elevation of a roller embodying my invention;

Figure 2 is a longitudinal section of the same; and

Figure 3 is a sectional view taken in the plane of line 33 of Figure 2.

40 The various novel features of'my inven-.

tion will be apparent from the following description and drawings and will be particularly pointed out in the appended claims.

Referring to the figures of the drawings, it will be noted that the roller includes a hollow cylindrical shell 10 preferably made of steel and provided with open ends. Her tofore such rollers for the most part have have been made solid so that the weight has been uniform throughout its whole length. As a result thereof such solid rollers have sagged intermediate their ends, causing injurious results referred to hereinabove. A cylindrical hollow shell of-itself would not furnish suflicient weightto cause uniform engagement with the plate forink distributing purposes. Accordingly, it is necessaryto add weight to the shell, but at the same time this weight must be applied in a manner to reduce to a minimum any tendency of the roller to sag intermediate its ends. To accomplish this object I have inserted into. the steel shell two members 11, preferably metal, having trunnions 12 at their ends whereby the roller may be supported. These members do not extend to the middle of the shell but are aced from each other to provide a cylindrical hollow portion 13 at the middle of the shell. Said 7 members 11 also are provided with hollow portions 14, which in this instance are coneshaped, the apexes of the conespointing to ward the outer ends of the members 11. In other-words, the weight of the loaded shell decreases inwardly from the apexes 15 toward the center, such decreases in the disposition of the weight being a gradual one.

It will be noted that these members 11 are not mere blocks set in the ends of the shell 10 for the purpose of supporting the trunnions 12, but are members which extend into the shell a considerable distance for loading the same to cause a uniform engagement 0 the plate by the shell and at the same time reduce to a minimum tendency of the roller F to sag at the middle. It will'be understood that the shell 10 is to be provided with the usual felt and leather layers, the latter of which forms the operative surface of the roller.

It is my intention to cover all modifications 'ofthe invention falling within the spirit and scope of the following claims.

1. A lithographic and printing form roller comprising a cylindrical shell, and means mounted in said shell for loading the same and distributing the weight therein for reducing the tendency of the: roller to sag intermediate its'ends.

2. A lithographic and printing form roller comprisin a cylindrical shell, and members moun in said shell and extending inwardly from the ends thereof to load said shell and distribute the weight therein .gis

Q emme,

to reduce the tendency of the roller to sag tions for decreasing the Weight thereof tointermediate its ends. Ward the middle of the shell for reducing 3. A lithographic and printing form the tendency of the roller to sag intermedi- 10 roller comprising a cylindrical shell, and ate its ends; 5 members mounted in said shell and extend- Signed at Chicago, Illinois, this 28th day ing inwardly from the ends thereof, said of December, 1921.

members being provided with hollow por- CARL HENDERSON. 

